DTC P0100:00 [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION))]

DESCRIPTION	Mass air flow sensor circuit performance problem
DETECTION CONDITION	Determination conditions	• The following conditions are met: ― The MAF sensor/IAT sensor No.1 determines an internal malfunction itself and the PCM receives error signals from the MAF sensor/IAT sensor No.1 for 5 s. ― The PCM receives a value other than the preset standard for the output value from the MAF sensor for 5 s.
	Preconditions	• The following DTCs are not detected: ― MAF sensor/IAT sensor No.1: U060F:00 • Engine speed: 500 rpm or more
	Drive cycle	• 1
	Self test type	• CMDTC self test, KOEO self test, KOER self test
	Sensor used	• MAF sensor/IAT sensor No.1
FAIL-SAFE FUNCTION	• Restricts the upper limit of the engine speed. • Inhibits the evaporative purge control.
VEHICLE STATUS WHEN DTCs ARE OUTPUT	• Illuminates check engine light. • Rough idling, poor acceleration, stalling
POSSIBLE CAUSE	• MAF sensor/IAT sensor No.1 loose • MAF sensor/IAT sensor No.1 connector or terminals malfunction • PCM connector or terminals malfunction • Short to ground in wiring harness between the following terminals: ― MAF sensor/IAT sensor No.1 terminal C—PCM terminal 2AT ― MAF sensor/IAT sensor No.1 terminal B—PCM terminal 2BE • Open circuit in wiring harness between the following terminals: ― MAF sensor/IAT sensor No.1 terminal C—PCM terminal 2AT ― MAF sensor/IAT sensor No.1 terminal B—PCM terminal 2BE ― MAF sensor/IAT sensor No.1 terminal A—PCM terminal 2AI • Short to power supply in wiring harness between MAF sensor/IAT sensor No.1 terminal B and PCM terminal 2BE • MAF sensor/IAT sensor No.1 circuits are shorted to each other • MAF sensor/IAT sensor No.1 malfunction • PCM malfunction

• The MAF sensor corrects the intake airflow amount inside the sensor based on the IAT sensor No.1 information. When there is an internal malfunction in IAT sensor No.1, the MAF sensor determines that there is a malfunction in itself and it sends a malfunction signal to the PCM. When the PCM receives a malfunction signal from the MAF sensor/IAT sensor No.1, the MAF sensor/IAT sensor No.1 determines an internal malfunction and stores a DTC.

In addition, when the PCM receives a value other than the preset standard for the output value from the MAF sensor continuously, the PCM determines that there is an internal malfunction in the MAF sensor/IAT sensor No.1 and stores a DTC.

Item	Definition	Unit	Condition/Specification
MAF	Mass air flow input from MAF sensor	g/Sec	• Displays MAF
MAF sensor voltage	V	• Ignition switched ON (engine off) (MAF: 0.00 g/s {0 lb/min}): Approx. 1.69 V (ECT is 53 °C {127 °F}) • Idle (after warm up) (MAF: 2.50 g/s {0.331 lb/min}): Approx. 1.89 V (ECT is 93 °C {199 °F}) • Racing (engine speed is 2,000 rpm) (MAF: 3.80 g/s {0.503 lb/min}): Approx. 2.02 V (ECT is 95 °C {203 °F})
IAT	Intake air temperature (No.1) input from IAT sensor No.1	°C, °F	• Displays IAT (No.1)
IAT sensor No.1 voltage	V	• IAT is 20 °C {68 °F}: Approx. 2.70 V • IAT is 40 °C {104 °F}: Approx. 1.80 V • IAT is 60 °C {140 °F}: Approx. 1.20 V

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the FREEZE FRAME DATA/snapshot data on the repair order.	—	Go to the next step.
3	PURPOSE: VERIFY RELATED PENDING CODE AND/OR DTC • Switch the ignition off, then ON (engine off). • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION))].) • Are any other PENDING CODEs and/or DTCs present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION))].) Go to the next step.
3		No	Go to the next step.
4	PURPOSE: VERIFY MAF SENSOR/IAT SENSOR No.1 INPUT SIGNAL • Start the engine and idle it. • Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION))].) ― MAF ― IAT • Is the PID value within specification?	Yes	Go to the next step.
4		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.
5	PURPOSE: VERIFY CONNECTOR CONNECTIONS • Start the engine. • Access the MAF and IAT PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION))].) • Does the PID value fluctuate when the following connectors are shaken? ― MAF sensor/IAT sensor No.1 ― PCM	Yes	Repair or replace the applicable wiring harness or connector parts. Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 7.
5		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.

STEP	INSPECTION	RESULTS	ACTION
1	INSPECT INSTALLATION OF MAF SENSOR/IAT SENSOR No.1 • Switch the ignition off. • Inspect installation of MAF sensor/IAT sensor No.1. • Is the MAF sensor/IAT sensor No.1 installed securely?	Yes	Go to the next step.
1		No	Retighten the MAF sensor/IAT sensor No.1, then go to Step 9. (See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.1 REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION)].)
2	INSPECT MAF SENSOR/IAT SENSOR No.1 CONNECTOR CONDITION • Disconnect the MAF sensor/IAT sensor No.1 connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
2		No	Go to the next step.
3	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
3		No	Go to the next step.
4	INSPECT MAF SENSOR/IAT SENSOR No.1 CIRCUIT FOR SHORT TO GROUND • Verify that the MAF sensor/IAT sensor No.1 and PCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― MAF sensor/IAT sensor No.1 terminal C ― MAF sensor/IAT sensor No.1 terminal B • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • MAF sensor/IAT sensor No.1 terminal C—PCM terminal 2AT • MAF sensor/IAT sensor No.1 terminal B—PCM terminal 2BE If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 9.
4		No	Go to the next step.
5	INSPECT MAF SENSOR/IAT SENSOR No.1 CIRCUIT FOR OPEN CIRCUIT • Verify that the MAF sensor/IAT sensor No.1 and PCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― MAF sensor/IAT sensor No.1 terminal C—PCM terminal 2AT ― MAF sensor/IAT sensor No.1 terminal B—PCM terminal 2BE ― MAF sensor/IAT sensor No.1 terminal A—PCM terminal 2AI • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • MAF sensor/IAT sensor No.1 terminal C—PCM terminal 2AT • MAF sensor/IAT sensor No.1 terminal B—PCM terminal 2BE • MAF sensor/IAT sensor No.1 terminal A—PCM terminal 2AI If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 9.
6	INSPECT MAF SENSOR/IAT SENSOR No.1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the MAF sensor/IAT sensor No.1 and PCM connectors are disconnected. • Switch the ignition ON (engine on). Note • Another DTC may be stored by the PCM detecting an open circuit. • Measure the voltage at the MAF sensor/IAT sensor No.1 terminal B (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between MAF sensor/IAT sensor No.1 terminal B and PCM terminal 2BE. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 9.
7	INSPECT MAF SENSOR/IAT SENSOR No.1 CIRCUITS FOR SHORT TO EACH OTHER • Verify that the MAF sensor/IAT sensor No.1 and PCM connectors are disconnected. • Switch the ignition off. • Inspect for continuity between MAF sensor/IAT sensor No.1 terminals C, B and A (wiring harness-side). • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • MAF sensor/IAT sensor No.1 terminal C—PCM terminal 2AT • MAF sensor/IAT sensor No.1 terminal B—PCM terminal 2BE • MAF sensor/IAT sensor No.1 terminal A—PCM terminal 2AI If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to each other. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to each other. Go to Step 9.
7		No	Go to the next step.
8	INSPECT MAF SENSOR/IAT SENSOR No.1 • Inspect the MAF sensor/IAT sensor No.1. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION)].) (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION)].) • Is there any malfunction?	Yes	Replace the MAF sensor/IAT sensor No.1, then go to the next step. (See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.1 REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION)].)
8		No	Go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION))].) • Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION))].) • Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION)].) Go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION))].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT CYLINDER DEACTIVATION))].)
10		No	DTC troubleshooting completed.